Concrete joist floor forms



Feb. 8, 1927. 1,616,846

J. H. DUNCAN ET ,N CONCRETE Josl1 FLOOR FORrs Filed Feb. 9, 192:5 O 2sheets-Sheet 1 Feb. 8, 1927. J' H. DUNCAN ET AL CONCRETE` JoIsT 'FLOOR`FORMS Filed Feb.

1925 2 Sheets-Sheet Patented Feb. 8, 1,927.

UNITED STATESv PATENT OFFICE.

JAMES H. DUNCAN AND SYDNEY EoGoW, 0E NEW YoEK, N. Y.

CoNCRE'rE JoIsr ELooE Forms.

Application inea February a, 1923. "serial Nb. 617,905.

This invention pertainsto the art ofmolding in situ floor slabs withjoists integral with such slabs, and the objects in view are, first, toso relate the molding devices to the under framing or shoring that theconstruction of the latter is simplified by the omission of partswithout loss of function; second, to provide for an adjustment of theforms in a manner to moldjoists or beams vthe depth of which isvariable; and, third, to provide for the removal of the forms when theslab shall have become set without disturbing the' supports for thejoists or beams, thus making the forms available for use in other falsework while the shorin or under framing and the soiit boards remain inplace for a desired period of time in order to support the joists orbeams until the concrete becomes set and hardened.

To these ends, our invention embodies soiiit planks set in edge-wiserelation to the shoring or under framing, soiiit members usuallyintheform of boards resting upon the upper edges of they soffit planks,forms each provided with flanged lower edges and positioned for Contactwith the edges of the Soffit members so as to occupy a cooperative rela.tion thereto and produce the mold cavity for the beams or joists, andmeans for supporting the forms in fixed positions and at desirableheights relatively to the soiiit members, whereby each form may becollapsed-relatively to the molded material and withdrawn' from contacttherewith.

In one embodiment of the invention, the displaceable forms are imposeduponstretchers which span the'spaces between the soit planks so as toact as stays for the latter, and to the soit planks are attached cleatsor battens upon which the stretchers are supported and along which thestretchers are supported and along which the st'retchers may be adjustedor shifted to positions reuired for the proper upholding of the orms,whereby the stretcliers may be positioned in proper relation to thedisplaccable forms and said strctchels may be displaced from the cleatsor battens in order to make way for the withdrawal ofthe forms.

' A preferred embodiment of the invention utilizes a plurality ofform-supporting membersy composed of metal and attachable individuallyto the soiit planks adjacent the lap between themeeting ends of themetal forms. Each form-supporting member is vposition ofthe soflitplanks and boards relatively to the concrete.

It is preferred, also, to sti'fen each displaceable form internallythereof with a view toprecludng the inward collapse of the form underthe pressure of the molded material, and to this end an internal bracemay be wedged into f rictional contact with the sides of the form orsaid brace may be pivotally mounted on the stretcher in a position forWedging Contact with the form.

Other functions and advantages of the invention willappear from thefollowing description taken in connection with the drawings, wherein-Figure 1 is a side elevation partly in section of our form for molding afloor slab' with integral joists.

Figures 2 and 3 are vertical cross sectional views illustratingdifferent positions of the displaceable form for-molding joists ofdifferent depths.

Figures 4, 5 and 6 of the drawings illustrate a preferred embodiment ofthe invention, wherein are used a plurality of lmetal form-supportingmembers in operativerela i tion to the sotlit planks and thedisplaceable unitary forms; Figure 4 being a longitudinal sectionalelevation; Figure 5 a vertical transverse section, and Figure 6 a detailperspective view of one of the metal supporting members.

' A are the sofiit planks set in edgewise relation to the under framingor shoring B, the

latter comprising battens b and posts b upon which the sofit planks aresupported directly so as to afford a simple and economicalstructurecomposed of relatively few parts adapted to be installed quickly forservice. .i

C are the sofiit membersl which constitute l the bottoms of the moldcavities for the jost's of the monolithic floor structure.. Said soitmembers are shown as boards of a desired width and'length, and they restflatwise upon the upper edges of the planks A, being attached thereto bynails or otherwise if required.

D are the forms, each being shown as composed of metal andiin a singlepiece, said form being adapted to be assembled as a unit and beingremovable in like manner. Each form is of a desired cross section, withits walls slightly diverging, and said form is provided at the lowerfree edges thereof with outwardly directed flanges (Z. Said frm is ofsuitable length, and in assemblingthe pairs of forms they are positionedfor the' end edges thereof-to be brought into contact, said forms havingoverlapping relation or endwise abutting contact. The forms D arepositioned for the sides thereofto have contact with the edges of thesoiiitl members C, but the anges d of .said forms extend below thesotlit members and toward the sotiit planks, said forms D being inco-operative relation to the soifit members C for producing therewith amold cavity 'within which concrete material is poured for producing thefloor joists integral with the floor slab.

For supporting the pan shaped forms in displaceable relation to thesotiit members A, C, and the shoring, we may us-e form-supportingmembers ofthe character shown in Figures 1 to 3, inclusive, whereinbattens E and stretchers F are positioned on the soiiit planks forupholding the unitary forms, or we may use metal form-supporting membersas shown in Figures 4 to 6, incluslve.

In the form shown in Figures 1, 2 and 3, the battens are fastened to thevertical sides of the planks A so as to extend lengthwise thereof andto'remain in fixed positions thereon, whereas the stretchers F restuponv the battens so as to be free to move lengthwise of the battens.`These stretchers are supported by the battens in movable relation to thesoflit planks` and thus the stretchers are shiftable at will in order tooccupy. positions below the pan like forms at the meeting or lapping endportions of said forms, whereby forms of different lengths are adaptedto be properly supported by the stretchers. The flanged lower edges `ofthe forms rest vdirectly upon the stretchers so that the weight oftheforms is imposed upon the stretchers. Said stretchers are in contact attheir end portions with the planks A and they perform the function ofstays for .members I of the character disclosed in Figpures 4, 5 and 6of the drawings. said members pertorn'nng the double. function of theplanks in-order to preclude lateral bowing or displacement thereof.

` Obviously, the battens E are attached to the planks A at a heightsuitable to support the forms at the required elevationwithY respecttothe soflt members C. In Figure 2, the battens or cleats are fastenedto 'the planks A at about midway they height thereof so as to supportthe forms in a raised position for molding a joist of adesired depth,

order that the forms may be dropped down with reference to the soiiitmembers C for.

molding a joist of decreased depth.

Means are provided interiorly of the form for precluding inwarddisplacement of the walls thereof under the pressure of the materialundergoing the molding operation. As shown in Figure 2, a strut G iswedged into contact with the opposite walls, and heid ilnlnovably inposition by frictional contact with the form, but in lieu of said strutwe mayuse a bar G', see Figure 9., attached to-one or more ofthestretchers F and positioned for contact with opposite walls of the format the lower edges thereof. Obviously, we vmay employ tlie'strut Gr orthe bar Gr", either or'both of the same.

In lieu of using a straight bar, it may be desirable to employ props Hadapted for contact separately with the opposite walls of said form` seeFigure 3. Said props are pivotally connected ath to the stretcher F, andthev are adapted to be forced into wedging engagement with the walls'ofthe form for precluding the inward bending or collapse of the metal panor form;

To use the apparatus. the under framing or shoring is erected withbattens and the planks A are set up edgewise thereon. The

cleats E are fastened at the proper height to the planks` sotiit membersC are placed upon the top edges of the planks, and

stretchers F are positioned upon the cleats,

after which the forms D are assembled into4 edgewise contact or intooverlapping relation. 'Ihe stretchers are shifted to fit beneath thelapping portions of they forms, and said forms rest uponthe stretchersand into contact with the sotlitv members. After the concrete is poured.all the parts remain in place for a required time to permit the slabs toset` whereupon the stretchers are shifted out of place and the forms Dare displaced from contact with the concrete, the flanged lower edges (Zof the forms moving downward away from the sotiitl members C and betweenthe planks A. The forms are thus withdrawn without disturbing the planksand the sotlit members, the same remaining in place for the timerequired in order that the mass of, conereteconstituting the joists may.set and harden.

clamping the unitary forms in sidewise relation to the sofit boards andof sustaining the weight of said unitary forms while permitting theready withdrawal of said forms without disturbing the, positions of thesoftit boards and soiiit planks. As in the construction of Figures 1, 2and 3, the unitary forms lou .verted pans,

D are composed of metal in theform of inand provided with flanges d attheir lower edges, said forms being assembled in substantially alinedrelation and with the end portions ot' each forml overlapping similarend portions of an adjacent form, such'overlap being indicated at d',

` Firure 4. Thel forms are positioned for the tlaisiges d to extendbelow the lsoilit boards,

.free from contact therewith, so that the forms can be raised or loweredas required, but the respective side walls of the pans are in sidewiseabutting relation to the edge portions ot'. the sotlit boards, seelFigure 5.

Each member I is composed of metal, either in east, wrought or struck upcondition, said member being provided with a head i, .an upstanding lugand a longitudinal slot 2. The head z' exceeds the thickness ot'theshank constituting the body of said member, see Figure 6, and the lugi extends upwardly from 'the head, at one end. The slot i2 is shown asextending through the lower end of the body or shank. To use the part I,it is positioned below the flanged edges (Z ot' the pans and at theoverlap gl between two adjacent pans. vThe slotted body of the member isapplied laterally against a face of the sollit plank A and occupies suchrelation thereto that the head i is in contact with the flanged loweredges (l of the pan or pans, and the lug z" is in lateral contact withthe pans at the lower open por-1 tion thereof. The member I is fastened`in place by driving a nail, spike, or other mem-` ber y' (one or more)through the slotted body and into the material of the soit plank. Saidmember is thus adapted to be ytiaedly attached to the soHit plank at apoint for supporting the pan or pans at the required height withrespectto the sollit boards, and in addition to sustaining the weight ofthe pans the members I are positioned for the lugs d to bind against thepans on the'inside thereof for the -purpose of confining or clamping thepan walls into sidewise contact with the soit boards, see Figure 5,thereby imparting stability t'o the pans.

The pans 'D and members I are adapted for ready and expeditiousassemblage` but when it is desired to dismount'tbe pans the members aredetached from the soilit planks 'by drawing out the nails. after whichthe unitary pans can be lowered and withdrawn from the concrete withoutdisturbing the soitboards or sotlit planks, thus enabling the pans to bere-u'ied during the periodre-` quired for the concrete to become set andhard.

Having thus fully disclosed the invention, what we claim as new anddesire taser-ure by Letters Patent is: i

1.A In a concrete form, the combination vfor slidable and pivotalmovement relatively to said form.-

2. In a concrete form, the combination with a soilit member, a soilitplank, and a t'orm positioned in contact with said sottit member, of aplurality of form-retaining members each having contact with an edge andthe face of said form, said form-retaining member being mounted on thesotlit plank for slidable and pivotal motion relatively to saidform.

-3.,In a concrete form, the combination with a solit plank, a softmember imposed thereon, and a form positioned for contact with an edgeof said sotlit member with the lower portions of the form extendingbelow said solt member, of a one-piece supporting body and a angedfhead,said slotted body being attached to the soit plank at a point v belowthe form and the flanged head being in contact with the lower part ofthe form.

'4. -In a concrete form', the combination with a sotlit plank, a sofitmember imposed thereon, and a form positioned for contact with an edgeof said soflit member with thev lower portions rof the form extendingbelow said soitit member, of a one-piece supporting and retaining memberembodying a headed and slotted body attached to the sollit vplanlf withthe head in contact with the form, sait' supporting'a'nd retainingImember being displaceable by a sliding and swinging movement'relativelytothe form` f 5. In a` concrete form, the combination with a soilitplank, a sotlitmemb'er and a form in contact with an edge of the sotlitmember, lof ay supporting and retaining member embodying a slotted, andheaded body form, said body member being positioned for the `headtoengage with the lower portion of the form.` r

6. In aconcrete form,a form-supporting and retaining member embodying aSlotted attached to the sollit plank belowthe body and a head unitaryone with the other, l

the slot in thev body extending lengthwise thereof and the headbeing inotl'standing position with respect to the body.

7. Ina concreteform, a form supporting member vcomposed of asin le pieceof metal t 'and embodying` a-slotted' ody, a head exceedingV the`thickness 4of the body, and-a lug extending outwardly from said head.

'In testimony whereof wel' have hereto signed our names 'this 7 day vofFeb., 1923.

, ',-sYDNEYERoGow JAMES H. DUNCAN.

